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<div class="title">samples/cpp/videowriter_basic.cpp</div>  </div>
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<p>An example using VideoCapture and VideoWriter class</p>
<div class="fragment"><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d0/d9c/core_2include_2opencv2_2core_8hpp.html">opencv2/core.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../dc/d3d/videoio_8hpp.html">opencv2/videoio.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span>, <span class="keywordtype">char</span>**)</div><div class="line">{</div><div class="line">    <a name="_a0"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> src;</div><div class="line">    <span class="comment">// use default camera as video source</span></div><div class="line">    <a name="_a1"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html">VideoCapture</a> cap(0);</div><div class="line">    <span class="comment">// check if we succeeded</span></div><div class="line">    <span class="keywordflow">if</span> (!cap.<a name="a2"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a9d2ca36789e7fcfe7a7be3b328038585">isOpened</a>()) {</div><div class="line">        cerr &lt;&lt; <span class="stringliteral">&quot;ERROR! Unable to open camera\n&quot;</span>;</div><div class="line">        <span class="keywordflow">return</span> -1;</div><div class="line">    }</div><div class="line">    <span class="comment">// get one frame from camera to know frame size and type</span></div><div class="line">    cap &gt;&gt; src;</div><div class="line">    <span class="comment">// check if we succeeded</span></div><div class="line">    <span class="keywordflow">if</span> (src.empty()) {</div><div class="line">        cerr &lt;&lt; <span class="stringliteral">&quot;ERROR! blank frame grabbed\n&quot;</span>;</div><div class="line">        <span class="keywordflow">return</span> -1;</div><div class="line">    }</div><div class="line">    <span class="keywordtype">bool</span> isColor = (src.type() == <a name="a3"></a><a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga88c4cd9de76f678f33928ef1e3f96047">CV_8UC3</a>);</div><div class="line"></div><div class="line">    <span class="comment">//--- INITIALIZE VIDEOWRITER</span></div><div class="line">    <a name="_a4"></a><a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html">VideoWriter</a> writer;</div><div class="line">    <span class="keywordtype">int</span> codec = <a name="a5"></a><a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html#afec93f94dc6c0b3e28f4dd153bc5a7f0">VideoWriter::fourcc</a>(<span class="charliteral">&#39;M&#39;</span>, <span class="charliteral">&#39;J&#39;</span>, <span class="charliteral">&#39;P&#39;</span>, <span class="charliteral">&#39;G&#39;</span>);  <span class="comment">// select desired codec (must be available at runtime)</span></div><div class="line">    <span class="keywordtype">double</span> fps = 25.0;                          <span class="comment">// framerate of the created video stream</span></div><div class="line">    <span class="keywordtype">string</span> filename = <span class="stringliteral">&quot;./live.avi&quot;</span>;             <span class="comment">// name of the output video file</span></div><div class="line">    writer.<a name="a6"></a><a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html#a0901c353cd5ea05bba455317dab81130">open</a>(filename, codec, fps, src.size(), isColor);</div><div class="line">    <span class="comment">// check if we succeeded</span></div><div class="line">    <span class="keywordflow">if</span> (!writer.<a name="a7"></a><a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html#a9a40803e5f671968ac9efa877c984d75">isOpened</a>()) {</div><div class="line">        cerr &lt;&lt; <span class="stringliteral">&quot;Could not open the output video file for write\n&quot;</span>;</div><div class="line">        <span class="keywordflow">return</span> -1;</div><div class="line">    }</div><div class="line"></div><div class="line">    <span class="comment">//--- GRAB AND WRITE LOOP</span></div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Writing videofile: &quot;</span> &lt;&lt; filename &lt;&lt; endl</div><div class="line">         &lt;&lt; <span class="stringliteral">&quot;Press any key to terminate&quot;</span> &lt;&lt; endl;</div><div class="line">    <span class="keywordflow">for</span> (;;)</div><div class="line">    {</div><div class="line">        <span class="comment">// check if we succeeded</span></div><div class="line">        <span class="keywordflow">if</span> (!cap.<a name="a8"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a473055e77dd7faa4d26d686226b292c1">read</a>(src)) {</div><div class="line">            cerr &lt;&lt; <span class="stringliteral">&quot;ERROR! blank frame grabbed\n&quot;</span>;</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        }</div><div class="line">        <span class="comment">// encode the frame into the videofile stream</span></div><div class="line">        writer.<a name="a9"></a><a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html#a30ebbc09c122332f62bd706b43f02a98">write</a>(src);</div><div class="line">        <span class="comment">// show live and wait for a key with timeout long enough to show images</span></div><div class="line">        <a name="a10"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Live&quot;</span>, src);</div><div class="line">        <span class="keywordflow">if</span> (<a name="a11"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(5) &gt;= 0)</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">    }</div><div class="line">    <span class="comment">// the videofile will be closed and released automatically in VideoWriter destructor</span></div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
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